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Phonovision, 1920s video disc

Phonovision, 1920s video disc

V400/0157

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Credit

SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY

Caption

Phonovision, 1920s video disc, coloured photograph. This is a standard 78 rpm (revolutions per minute) gramophone disc, used by the Scottish engineer John Logie Baird (1888-1946) to record the output from his television system. The principle is the same as a gramophone, with an electromagnetic needle used instead to detect and convert the indentations on the disc back into light and sound on a television screen. Baird was granted a patent on his Phonovision system in 1928, but the image quality was poor compared to cinemas. Original photograph published in Television (Dinsdale, 1928).

Release details

Model release not required. Property release not required.

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